Join Date: Jan 2015
Location: Injun Territory, 'Merica!
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The gray iron housing 9792977 was built with axle tubes and is either late '66 model use, or '67 model use. This particular center housing casting number was even used on housings for lower performance '67 Firebirds.
With the stamped assembly codes being tough to read, the easist way to identify which model year application is to look at the coil spring perches.
-Is the perch flat with a hole in the center, and take a stamped steel "ear" shaped piece to bolt the coil spring down, if so, with that casting number, late '66 usage.
-OR does the top of the coil spring perch flare up 1/2", with a locator ring being a part of the perch? If so, the rear was used in a '67 or extremely early '68 Pontiac, or possibly, a '67 Buick A-body.